Stretching Before or After a Run: A False Debate?

Ah, stretching… Few topics in running generate as much conflicting advice. "You need to stretch beforehand to avoid injuries." "No, it decreases performance." "You should stretch afterward." "No, not on a warm muscle." The result: most of us no longer know what to do — and many end up doing nothing at all. So I delved into the question. Here's what I found.

Static vs. Dynamic: Not the Same Thing

Static Stretching

These are the classics: you hold a position for 15 to 30 seconds, lengthening the muscle. Think calves against a wall, quad stretches by pulling your foot behind you, or seated hamstring stretches. This is what most people picture when they hear "stretching."

Dynamic Stretching

Here, you move your joints and muscles through controlled, repeated motions: knee drives, butt kicks, leg swings, walking lunges. The goal isn't to lengthen the muscle but to warm it up by increasing its range of motion.

Before Your Run: What the Studies Say

Static Stretching: To Be Avoided

The most consistent finding from my research: static stretching before exercise temporarily reduces your force production capacity. A meta-analysis showed a 5 to 8% drop in muscle strength after prolonged static stretches (> 60 seconds). For runners, this can translate to a slightly lower Maximum Aerobic Speed (MAS) and degraded running economy.

And what about injury prevention? Studies are clear: static stretching before exercise does not reduce the risk. Several systematic reviews confirm this conclusion. It's surprising, but that's the science.

Dynamic Stretching: Recommended

Dynamic warm-ups, on the other hand, are associated with better neuromuscular preparation. They warm up muscles, improve nerve transmission, and prepare joints. This is why most modern coaches recommend a 5-10 minute dynamic routine before a workout, especially before interval training or a race.

After Your Run: The Gray Area

The Myth of Soreness Prevention

For a long time, it was claimed that stretching after exercise reduced muscle soreness. Studies haven't confirmed this. A review published in the British Journal of Sports Medicine concludes that post-exercise stretching has no significant effect on delayed onset muscle soreness (DOMS). Personally, I found this surprising.

Flexibility: Do We Really Need It?

Static stretching after exercise can help maintain flexibility — but is it truly necessary for a runner? The question is divisive. A certain degree of tendon stiffness is even beneficial for running economy: the Achilles tendon acts like a spring, and a too-flexible spring loses energy. Some researchers believe that overly flexible runners are less economical. Counterintuitive, isn't it?

What Do Elite Runners Do?

If we look at the practices of high-level runners, there's a lot of diversity. Some Kenyan marathoners almost never stretch. Others, particularly track runners, incorporate dynamic stretches into every warm-up. The common thread: almost none do static stretching before a fast workout, and all incorporate strength training.

My Routine (and What I Recommend)

Here's a reasonable approach, consistent with what studies suggest:

1. Before every run — 5-10 min of dynamic warm-up (knee drives, butt kicks, walking lunges, leg swings)
2. Before an intense workout — add 5-10 min of very easy jogging before the dynamic warm-up
3. After your run (optional) — gentle stretches, without forcing, if they feel good. Never intense stretches on a fatigued muscle.
4. As a separate routine — yoga or a mobility session 2-3 times a week, separate from your running workouts, is likely more beneficial than quick stretches on the side of the road.

And for easy runs at an easy pace, the first 5-10 minutes of very slow running serve as a sufficient warm-up in most cases.